CVE-2026-14456Network attack vector

Service interruption via unbounded QUIC connection queue

Published Aug 13, 2026 · Updated Aug 13, 2026

OpenSSL 3.5.0 through 3.5.7, 3.6.0 through 3.6.3, and 4.0.0 through 4.0.1 allows remote attackers to interrupt QUIC service. The QUIC listener treats each valid Initial packet with an unknown destination connection ID as a new connection and queues a newly allocated channel without a pending-connection limit. Sending Initial packets faster than the application calls SSL_accept() causes unbounded memory growth and can make the listener unavailable.

CVSS severity7.5
High
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OpenSSL 3.5.0 through 3.5.7, 3.6.0 through 3.6.3, and 4.0.0 through 4.0.1 allows remote attackers to interrupt QUIC service. The QUIC listener treats each valid Initial packet with an unknown destination connection ID as a new connection and queues a newly allocated channel without a pending-connection limit. Sending Initial packets faster than the application calls SSL_accept() causes unbounded memory growth and can make the listener unavailable.

The record

CVE
CVE-2026-14456
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
OpenSSL Project
Product
OpenSSL
Classifications
CWE-770, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.5.0 <3.5.8
  2. Affected versionversion=3.6.0 <3.6.4
  3. Affected versionversion=4.0.0 <4.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenSSL Project · OpenSSLversion=3.5.0 <3.5.8; version=3.6.0 <3.6.4; version=4.0.0 <4.0.2

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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